Pump control.



M. D. COMPTON.

PUMP CONTROL. APPLIOATION FILED DBO.13, 1913.

Patented Nov. 10, 1914.

2 SHEETS-SHBET 1,

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M. D. COMPTON. PUMP COTROL. APPLICATION FILED DEO.13,1913.

1,1 1 6,998. v Patented Nov. 10, 1914.

I 2 SHEETS-SHEET 2.

MnLvIN D. comrtr'oN, nsw YORK, N'. Y.

Specification of letters atent. Application mea' December 13, i'i''. seal no. segu. l

mi" common.

Patentes Nov. 1o, 1914.

To all whom t may concern: Be it known that I, MELVIN D'. COMPTON,

a citizen of the United States, ,and a lresident of New York, in the county of New York and State of New York, have invented certain new 'and useful Improvements im Pump'Control, of which the following is a specification. v

The principal objects of the present invention are to automatically insure the presence ina vessel or container of aV supply of air under limited pressure; to provnle for automatically connecting and disconnecting a pump or compressor with driver inresponse toy limited'l changes ofA pressure inthe air receiver or reservoir, and

V to provide simple, automatic and reliable means adapted among other things for use in connection with .airl systems of motor cars or automobiles vfor automatically main"y taining. a supply of compressed air Aunder limited pressure by connecting and disconnecting a Ipump or compressor with some rotating member or element of the car.V or automobile. f V

" -The invention be claimedf'at the end hereof, but will be r'st described in connection with the embodiment, of itchosen for illustration in the accompanying drawings, in which- Figure 11, is anA elevationalvievv, principallyin section, of mechanism embodying' features of the invention. Fig. 2,1s'a sectional view on the line I2f-2of Fig.- 1, Fig.' 3, is a\sectional view on the line of Fig. 2, and Fig. 4, is av section on the line 4 4' ofFig. 1.

There is an air pump or compressor.- It

is shown as consisting ofa casing 1 having opposed cylinders -2' and 3, eachprovided with air inlets 4 and with air -Ioutlets 'and appropriate check valves 6 and I for the't same, and of a pair of pistons; 8 connected -together'through the yoke 9 of an eccentric 1.0. When the eceentric-revolvesthe .pn'mo compresses air and delivers it by way of theqofftake 11 to-a suitable air tank or receiver, .not shown, but from whichl air is vtaken as it may `be required for any purpose. .c

12, is a driven shaft and it may be one of 'i the shafts of a motororn automobile. This shaft' drives 011e member l13 of a sliding clutch, the other member 14 of which is connected with the eccentric shaft 15, As

shown this is accomplished 'by intermesh.

The spring 21 tends to keep the clutch members in; engagement in which .position the' pump is-driven continuously from the a 22,- is` a clutch opening `diaphragm and it isarranged-to sub-divide a chamber 23.v

24, is 'a plunger, the head ,of which .rests upon the diaphragm and the stem 2 5 of which engages a shoulder on the' clutch member 14'. Within theV casing 29there is awcheck valve31, which by controlling port .30, controls the admission of compressed air'gfrom" the delivery tube 35 to the diaphragm 22 by way of 'the opening' 33; :The check valve is held to" its seat' by an adjustable spring by means of which the pressure requiredto open it canbe fixed and determined 28, is a relief valve, connected with a plunger 2.6', which is acted upon by. the air pressure inthe tube 35 by means of the bypass 32. This .relief valve controls the exhaust of lairrom the diaphragm by Way of opening 36 and exhaust passage 34, al-

though]` plunger 26 is always in connection with the compressed air, spring 27 beneath it is of suiiicient tension to hold the relief .valve olf its, seat until' the air pressure has risen to y'the required amm-int.Y Y

In the position of the parts shown inthe predetermined drawings-the clutch members arem engagement andthe pump is being driven which means that the'pressure of the air' supply is .less than its limiting.- pressure, or thatiair `is being used. 'Under these conditions the check valve 31 is closed and ,relief valve 28 and the clutch'members 13 and 14 are in engagement by the pressure of the spring 21; It will now be assumed that the pressure in the tank y'o r reservoir and, of course, in the off-take 11, rises to its limiting value.- This rise of pressure does two things, it closes relief valve 28, shutting oli the connection of the diaphragm with the exhaust, and it opens check valve 31,.admitting air pressure behind said diaphragm, thereby. acting upon the plunger 24 to throw clutchymember 14 out of'engagement with clutch member 13.,

Under these circumstances the pump stops and remains at rest until the pressure in the tank or reservoir and consequently in the pipe 11 and parts connectedtherewith falls, which it will do, for example, when an additional supply of air is used. When the pressure falls in the port below the point at which it can hold the check valve 31 open, the check valve closes, cutting 0E the pressure from the diaphragm 22. At the .same time the relief valve 28 has opened putting the diaphragm in communication with,

the prior state of the art may require by the use of any particular language that may be used herein. v Y

lVhat I claim is:

' 1. A pneumatic device comprising the combination of an air compressor and an air line, a driving clutch for the compressor, a diaphragm for throwing the clutch,re versely acting check and relief valves' and their ports for admitting and exhausting air to and from the diaphragm, and means for constantly exposing said valves tothe air pressure in theline, whereby the compressor is automatically run Awhen the air pressure is below a certain limit and is automatically stopped when the air pressure is above a certain limit.

v 2. In a pneumaticdevice the combination of an air chamber, a diaphragm subdividing the air chamber, reversely acting check and relief valves and their ports for exhausting air to and from the space between one side of the diaphragm and the wall of the chamber, and means for 'subjecting said valves to dierences in air pressure to automatically open and close them, substantially as described.

3. "In apneumatic device the combination of a chamber, a diaphragm subdivided by the chamber, an air line, a spring Iclosed check valve having its head exposed to the line pressure and adapted to admit air to the diaphragm, and a spring opened relief valve `havi1ig its tail exposed to the air line and adapted to exhaust air from the diaphragm, substantially as described.

4. A- pneumatic device comprising the combination of a positively driven shaft, an air line, a compressor, a u tch between the compressor and shaft, a p unger for throwing the clutch,a chamber, a diaphragm subdividing the chamber and cooperating with the plunger, oppositely disposed check and relief valves and their ports for admitting and exhausting air to and from the diaphragm, means forconstantly exposing the head of# one of said valves and the tail cf the other of saidvalves to the pressure of vair in the line, and means for normally closing the check valve and for normally opening the relief valve whereby the compressor is automatically operated from the shaft when the air pressure in the line is low and is 'automatically disconnected from the shaft when the air pressure in the line is high.

5. A pneumatic device comprising the combination of an air compressor and au :ur

line, a driving clutch for the compressor, a

.diaphragm for throwing the clutch, re-

versely acting check and relief valves and their ports for admitting and exhausting air to and'from 'the diaphragm, a second diaphragm for the relief valve, and means for constantly subjecting said valves to the air pressure in the line, whereby the compres sor is automatically run when the air pres- 'sure is below a certain limit and is automatically stopped when the air pressure is abovea certain limit.

In testimony whereof I have hereunto signed my name in the presence of two wit- 

